#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define rep(i, a, b) for (int i = (a); i <= (b); i++)
#define per(i, a, b) for (int i = (a); i >= (b); i--)
#define endl '\n'
const int N = 2e5 + 5;

int n, m;
int a[N];
ll ipow(ll b, ll p) {
  if (b == 1) return 1;
  ll res = 1;
  rep(i, 1, p) {
    res = res * b;
    if (res > 1e9) return -1;
  }
  return res;
}
int main() {
  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  int a, b;
  cin >> a >> b;
  cout << ipow(a, b);
  return 0;
}